Black Holes

1
Black Holes
2
(No Transcript)
3
(No Transcript)
4
Black Holes

• The intense gravitational field left when a giant
  star collapses

5
(No Transcript)
6

• It is called a black hole because not even light
  can escape

7
(No Transcript)
8
(No Transcript)
9
Photon Sphere

• The outer edge where light bends but is still
  escapable

10
Event Horizon

• The point at which no light can escape

11
Singularity

• The shrunken star too small to be measured but
  with indefinite density

12
(No Transcript)
13
Galaxies
14
Galaxy

• A large assembly of stars and nebulae

15
Group of Galaxies
16
The Milky Way

• Our galaxy
• Flat disk with spiral arms

17
(No Transcript)
18
Three Types of Galaxies
19
Elliptical

• Oval shaped
• Most common type of galaxy found

20

• Contains little gas and dust
• Most are dim and difficult to see

21
(No Transcript)
22
Spiral

• Dense center with spiral arms
• Bright and easy to see

23

• Contains large amounts of gas and dust always
  producing new stars

24
(No Transcript)
25
(No Transcript)
26
Irregular

• No specific shape
• Contains large amounts of gas and dust

27

• Small and faint therefore hard to see

28
(No Transcript)
29
Quasars
30
Quasars

• Small, powerful source of energy thought to be
  cores of distant spiral galaxies

31

• They emit radio waves and bright light

32
(No Transcript)